JP2007063796A - Structure and method for widening connection of bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure and a method for widening the connection of a bridge which enable the widening of the existing bridge while enhancing the durability of a vertical joint section between the existing bridge and a new girder. <P>SOLUTION: A horizontal hole 36 is formed at the existing bridge 33; a prestressing force introducing device equipped with a hollow prestressing steel bar is arranged in the horizontal hole 36; grout 17 is injected into and hardened in the horizontal hole 36; the prestressing (PC) steel bar 6 is tensioned and anchored in a state of being embedded at the side of the existing bridge 33; the new girder 34 is arranged on the side of the widening of the existing bridge 33; the prestressing steel bar such as single-stranded steel material 2 is arranged in the horizontal hole 37 of the new girder 34, connected to the widening-side end of the prestressing steel bar 6, and anchored in a tensioned state; the grout 17 is injected into and hardened in the horizontal hole 37 of the new girder 34; and the existing bridge 33 and the new girder 34 are integrated to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bridge widening connection structure and a connection method.

  Conventionally, when widening in order to increase lanes with increasing traffic volume, a method is known in which a new girder is installed and widened after removing the ground cover, vehicle protection fence, etc. on the existing bridge (for example, Patent Documents 1 and 2).

  (1) If the upper floor slab of the existing bridge is of an overhang type such as an overhang flange, when it is widened, it becomes a structure type in which the wheel load of an automobile or the like acts on the overhang end, and the connection is Because it is difficult, a new girder was installed as a separate structure adjacent to the existing bridge, and the existing bridge mainly had a separate structure with vertical joints in the direction of the bridge axis.

  In addition, (2) in the case of a separation structure, it may be possible to adopt a structure type in which the overhanging flange is supported on the side of the newly installed girder. There is a problem that the property is lowered, and there is a disadvantage that a problem in durability of the road occurs due to the vibration of the step portion.

As described in (1) above, since it is difficult to construct a continuous structure of the RC structure in the direction perpendicular to the bridge axis in joining the existing bridge and the new girder, a separation structure is often used. When the separation structure as described in (2) is used, when connecting an existing bridge and a new girder, a vertical joint is provided between them, and the durability and running performance of the vertical joint become a problem. come.
JP 2005-105652 A JP 2005-127066 A

  An object of the present invention is to provide a bridge widening connection structure and a connection method capable of widening an existing bridge while improving the durability of a vertical joint between an existing bridge and a new girder.

  In order to solve the above-mentioned problem advantageously, in the widening connection structure of a bridge according to the first invention, a prestress force introducing device is provided in which a horizontal hole is provided in an existing bridge and a hollow PC steel rod is provided in the horizontal hole. At the same time, the grout is injected and hardened, the tension is fixed with the hollow PC steel bar embedded in the existing bridge side, a new girder is placed on the wide side of the existing bridge, and the PC steel material is placed in the side hole of the new girder The PC steel material is connected to the wide side end of the hollow PC steel rod, the PC steel material is tension-fixed, and grout is injected and hardened in the lateral hole of the newly installed girder. And are integrated.

  Further, in the second invention, in the bridge widening connection structure of the first invention, a connection hardware provided on the single-strand steel material side as a PC steel material is connected to the thread portion of the hollow PC steel rod end. And

  In the third invention, the bridge widening connection structure according to the first invention is characterized in that prestress is introduced and integrated to a new girder arranged to widen from the existing bridge including the widening joint. And

  Further, in the widening connection method of the bridge of the fourth invention, a horizontal hole is drilled in the existing bridge, a prestress force introducing device including a hollow PC steel rod is disposed in the horizontal hole, and grout is injected and hardened. Later, the hollow PC steel rod is tension-fixed, prestress is introduced into the existing bridge, a new girder is arranged on the wide side of the existing bridge, and a PC steel material is inserted into a lateral hole of the new girder, and the hollow PC steel rod The PC steel material is connected to the widening side end of the steel plate, and after the PC steel material is tensioned, grout is injected, and the existing bridge and the new girder are integrated.

  In the fifth invention, the bridge widening connection method according to the fourth invention is characterized in that the single strand steel material is connected using the threaded portion of the hollow PC steel rod end.

According to the first invention, a horizontal hole is provided in an existing bridge, a prestressing force introducing device having a hollow PC steel rod is disposed in the horizontal hole, a grout is injected and hardened, and the hollow PC steel rod is installed. The tension is fixed in an embedded state on the bridge side, a new girder is arranged on the widening side of the existing bridge, a PC steel material is arranged in a lateral hole of the new girder, and the PC at the widening end of the hollow PC steel bar The steel material is connected and the single-strand steel material is tension-fixed, and the grout is poured and hardened in the lateral hole of the new girder, so that the existing bridge and the new girder are integrated. Installed, fixed the hollow PC steel rod in the pre-stress force introduction device in tension, and connected the tension fixing device made of the new PC steel material inserted through the lateral hole of the new girder to the existing hollow PC steel rod And fix the tension And it makes it possible to easily integrate the new order of magnitude as the existing bridges.
Moreover, since it is not necessary to provide a vertical hole etc. in the upper surface side of an existing bridge and a new girder, since there is no construction on the upper surface side in an existing bridge or a new girder, widening construction can be performed with as little traffic obstruction as possible.

  In addition, according to the second invention, a single strand steel material is used for tension integration of the newly installed girders, and since the connection hardware is connected to the single strand steel material, utilizing the flexibility of bending of the single strand steel material, It can be easily inserted and arranged in a lateral hole that penetrates the newly installed girder.

  According to the third invention, prestress is introduced and integrated to the new girder arranged to widen from the existing bridge including the widening joint, so that the existing girder and the new girder are perpendicular to the bridge axis. The PC steel material can be disposed and integrated firmly over almost the entire length.

According to the fourth invention, a horizontal hole is drilled in an existing bridge, and a prestress force introduction device equipped with a hollow PC steel rod is arranged in the horizontal hole to inject and harden the grout, thereby introducing prestress into the existing bridge. PC steel is connected to the wide side end of the hollow PC steel bar fixed to the existing bridge, and the PC steel is tensioned, then grout is injected, and the existing bridge and the new girder are integrated. Therefore, the hollow PC steel rod can be easily fixed to the existing bridge, and the PC steel material can be easily connected to the hollow PC steel rod, so that the existing bridge and the new girder can be integrated.
Moreover, since it is not necessary to provide a vertical hole etc. in the upper surface side of an existing bridge and a new girder, there is no construction of the upper surface side in an existing bridge or a new girder, and widening construction can be performed with as little traffic obstruction as possible.

  According to the fifth invention, since the single-strand steel material is connected using the threaded portion of the hollow PC steel rod end, the single-strand steel material side is simply provided on the hollow PC steel rod fixed to the existing side. Therefore, it is possible to reduce the number of parts by simplifying the joining structure and to provide a cheaper connection method.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  First, the structure of one form of the prestressing force introducing device 8 using reaction force PC steel used in the present invention will be described with reference to FIG.

  Fig.3 (a) shows the partially cutaway side view of 1 unit of the prestressing force introduction | transduction apparatus 8 for concrete using the hollow PC steel bar of one Embodiment used in this invention, (b) is the vertical side surface. As shown, the steel hollow PC steel rod body 6a has a male threaded portion 20 outside one end (front end) in the longitudinal direction and a male threaded portion 21 outside the other end (rear end). A female screw hole 22 at the front end of a bearing cylinder 25 having female screw holes 22 and 23 at both front and rear ends and a polygonal rotating tool engaging outer surface 24 is screwed into the male screw portion 21 of the hollow PC steel rod 6. Has been.

  A front male screw portion 27 of a stopper 26 made of a steel tubular annular locking piece is screwed into the female screw hole 23 at the rear end portion of the support tube 25, and a rotation is provided outside the rear end portion of the stopper 26. A moving tool engaging outer surface 28 is formed.

  The front end portion of the stopper 26 is disposed inside the support cylinder 25, and the rear end surface of the press locking piece 30 having the concave portion 29 is engaged with the front end portion, and the concave portion 29 of the front end portion of the press locking piece 30 is engaged. In the hollow PC steel rod 6, almost the whole other than the other end side is inserted and the other end side is arranged so as to protrude from the other end portion of the hollow PC steel rod 6. The rear end of 7 is fitted.

  The pushing reaction force PC steel rod 7 may be a non-pull type (non-pulling type) stationary type.

  In this embodiment, the indentation steel bar 7 is constituted by a single indentation reaction force PC steel bar 7, but the other end side has a short removal reaction force PC steel bar and the indentation reaction force PC steel bar. The push-in reaction force PC steel rod 7 can be constituted by two pieces of the push-in reaction force PC steel rod slightly shorter than 7.

  An anchor member 32 made of a nut having a female screw portion 31 is detachably screwed to the male screw 20 outside the front end portion of the hollow PC steel rod 6, and the tip portion of the pushing reaction force PC steel rod 7 is the female screw. The portion 31 is indirectly engaged via the male screw member 41. A male screw member 41 is screwed and fixed to the anchor member 32, and the distal end portion of the reaction force PC steel rod 7 is supported by the male screw member 41. An anchor member 19 made of a nut is attached to the male screw portion 21.

  In the state shown in FIG. 3, the inner reaction force PC steel rod 7 is pushed into the outer hollow PC steel rod 6, and the compression force of the reaction force PC steel rod 7 and the hollow PC steel rod 6 are suspended. It is the state engaged in the state. Such a prestressing force introducing device 8 is known from Japanese Patent Application Laid-Open No. 2001-207590 and the like, and various types of devices including a pushing reaction force PC steel rod and a hollow PC steel rod can also be used. .

  Next, after the support cylinder 25 in the prestress force introduction device 8 was removed, a PC steel material such as a single strand steel material 2 connected to the hollow PC steel rod 6 and tension-fixed to the newly installed girder 1 side was provided. An example of the structure of the new-side tension fixing device 3 will be described with reference to FIGS. 9 and 8.

  FIG. 9A shows a part of the first-side tension fixing device 3 according to the first embodiment, and a steel sleeve is attached to one end of the existing side of the single-strand steel material 2 as the PC steel material on the new girder side. The steel sleeve 4 has a female screw hole 9 on the existing side and an insertion hole 10 on the new side, and a support portion for the steel sleeve 4 around the insertion hole 10. One end side of the bottomed cylindrical connecting metal 11 having the engagement is engaged, the single strand steel material 2 is inserted into the insertion hole 10 of the connecting metal 11, and the steel sleeve 4 is disposed inside the connection metal 11. Then, the female screw hole 9 of the connection hardware 11 is connected to the male screw portion 21 of the existing hollow PC steel bar 6 as a joint with the existing hollow PC steel bar 6. Such a connection hardware 11 is preferable because when the connection hardware 11 is rotated, the steel sleeve 11 and the single-strand steel material 2 are rotated and the single-strand steel material 2 is less likely to be twisted. Note that the outer surface of the connection hardware 11 has a hexagonal cross section as appropriate, and a rotating tool engaging portion is provided on the outer surface.

  In addition to the above-described new tension fixing device 3, as shown in FIG. 9B, the inclined surface 13 is provided on the inner surface of the bottomed cylindrical connecting metal 11, and the single-strand steel material 2 is provided. You may make it latch with the wedge 12 (it mentions later for details). Moreover, as shown in FIG.8 (b), the internal thread hole 14 is provided in the edge part inner side of the hollow PC steel rod 6, and as shown in FIG.9 (c), it is made of the steel fixed to the single strand steel material 2. A male threaded portion 5 may be provided on the outer surface of the sleeve 4 to form a male threaded sleeve 15, and the male threaded sleeve 15 may be screwed into the female threaded hole 14 of the hollow PC steel rod 6 (details will be described later).

  Moreover, as a fixing structure of the other end part of the single-strand steel material 2, a known fixing structure can be adopted as appropriate. For example, as shown in FIG. According to a wedge method, the plate 18a and a female cone (cylindrical wedge receiving metal fitting) having a fixing fitting 18 provided with a female cone (cylindrical wedge receiving metal fitting) are inserted into an insertion hole, and the single-strand steel material 2 is fixed by a wedge pressed into the female cone in a tensioned state. Although not shown, the single-strand steel material 2 is appropriately provided with a male threaded sleeve having a male threaded portion, and is fixed to the support plate 18a in tension by a female threaded fitting. At the same time, the grout 17 may be filled and cured to be integrated.

  Next, in addition to the use of the prestress force introduction device 8 and the use of the new tension fixing device 3, the structure of the existing girder 34 in the existing bridge 33 and the new girder 1 on the new side are joined and A method will be described.

  First, from the state of the existing bridge 33 shown in FIG. 1 (a), as shown in FIG. 1 (b), a side hole 36 is drilled from the side surface 35 on the new side of the existing girder 34 having a T-shaped cross section in the existing bridge 3. To do. In the illustrated form, a large number of horizontal holes 36 are drilled from the side surface of the upper flange 38 of the existing girder 34 to reach the back of the entire width of the existing girder 34 in the width direction at intervals in the axial direction. Is done. Although not shown in the drawings, a locking groove having an annular large-diameter locking groove is provided at the back or middle of the lateral hole 36 to ensure adhesion with a grout such as a non-shrink mortar. A horizontal hole can be used to ensure the fixing of the tip of the hollow PC steel rod 6.

  Next, as shown in FIG. 2, the prestress force introduction device 8 is disposed in each lateral hole 36 in a state where the support cylinder 25 in the prestress force introduction device 8 protrudes outside the lateral hole 36. The grout 17 is filled between the horizontal hole 36 and the prestress force introduction device 8 to cure the grout 17. Next, as shown in FIG. 4, the reaction force PC steel rod 7 is opened by removing the support cylinder 25 (or stopper 26) from the hollow PC steel rod 6 so as to be retracted to the new side (right side in the figure). Then, compression prestress is introduced into the existing girders 34 to fix the hollow PC steel rods 6 in tension, and the hollow PC steel rods 6 are fixed to the existing bridges 33 (existing girders 34). By fixing the hollow PC steel rod 6 in a tensioned state in this way, when the single-strand steel material 2 as a new PC steel material connected to the hollow PC steel rod 6 is tension-fixed, the hollow PC steel rod Until the tension force becomes equal to 6, the elongation of the hollow PC steel rod 6 can be suppressed, and the displacement on the existing girder 34 side can be suppressed to zero.

  As shown in FIG. 5, in order to support the newly installed girder 1, an existing lower structure for the widened portion extending in the direction perpendicular to the bridge axis is installed on the adjacent existing lower structure 39 in the bridge axis direction as necessary. Build and unite. Next, a support device 43 such as a rubber support is installed on the upper surface of the existing lower structure 39 on the widened portion side, and a precast new girder 1 such as a T-shaped cross section is installed on the support device 43. The new girder 1 is provided with a lateral hole 37 penetrating in a direction perpendicular to the bridge axis (in the widening direction) in parallel with a gap in the bridge axis direction.

  The new girder 1 is arranged in parallel with the vertical joint interval G with respect to the existing bridge 33. Next, the single strand steel material 2 in the new tension fixing device 3 is inserted from the existing side (or the new girder side) into the lateral hole 37 that penetrates the entire width of the upper flange 38 of the new girder 1 and is shown in FIG. The connection hardware 11 in the new side tension fixing device 3 is screwed and connected to the end of the hollow PC steel rod 6 from which the support tube 25 is removed as shown in FIG.

  Further, as shown in FIG. 5, the new side end of the single-strand steel material 2 is inserted into the insertion hole of the fixing metal fitting 18 arranged at the end of the new girder 1. It should be noted that a sheath (not shown) is appropriately disposed in the vertical joint interval G, and the connection hardware 11 is disposed in the sheath.

  Next, as shown in FIG. 6, a formwork (not shown) is used to place concrete (or non-shrink mortar) 44 in the gap between the existing girder 34 of the existing bridge 33 and the vertical joint 16 between the new girder 1. ) To place concrete 44.

  After the concrete 44 of the vertical joint 16 has hardened, the end of the single strand steel material 2 is tensioned by a hydraulic jack with a gripping device (not shown) or the like to fix it to the fixing bracket 18, and a new girder The pre-stress is introduced so as to bring 1 close to the existing girder 34, and the grout 17 such as a non-shrink mortar is filled and hardened in the horizontal hole 37 and the sheath in the vertical joint portion of the new girder 1 so that the existing bridge 33 And the new girder 1 are firmly integrated.

  As a tension fixing means for the end of the newly installed girder 1 of the single strand steel material 2, the wedge 12 may be driven between the fixing bracket 18 and the single strand steel material 2 to fix the tension. A steel sleeve having a male thread portion may be fixed to the single-strand steel material 2 in a tensioned state by a fixing bracket such as a nut outside the fixing bracket 18. The fixing bracket 18 at the end of the newly installed girder is appropriately subjected to rust prevention treatment.

  When implementing the present invention, as the connection hardware 11 in the new-side tension fixing device 3, other forms other than the above-described embodiment can be used. This will be described with reference to FIGS.

  FIG. 9B shows a part of the single-strand steel material 2 and the connection hardware 11 in the new-side tension fixing device 3 in another form, and FIG. 8A shows the use of the new-side tension fixing device 3 in that form. The connection structure with the existing hollow PC steel rod 6 is shown.

  In the form of FIG. 9 (b), the connection hardware 11 is fixed to the existing side end of the single-strand steel material 2 by the wedge 12, and more specifically, the connection hardware 11 is formed on the inner surface of the existing side. In addition to having a female screw hole 9, it is a cylindrical hardware having a frustoconical inclined surface 13 that is smaller in diameter than the female screw hole 9 and gradually decreases toward the new side.

  Also, the existing side end of the single strand steel material 2 is arranged inside the frustoconical inclined surface 13 so as not to be located deeply in the female screw hole 9, and the frustoconical inclined surface 13, the single strand steel material 2, A plurality of wedges 12 are press-fitted in between, and the connection hardware 11 is fixed to the single strand steel material 2.

  As shown in FIG. 8 (a), the female screw hole 9 of the connection hardware 11 in the new-side tension fixing device 3 provided with the single strand steel material 2 to which the connection hardware 11 is fixed as described above is a hollow PC steel on the existing side. It is screwed into the male thread portion 21 of the rod 6 and connected to the existing hollow PC steel rod 6.

  Further, as shown in FIG. 9 (c), a new-side tension fixing device 3 in which a male-threaded sleeve 15 is fixed to an end portion of the single-strand steel material 2 and a male-threaded portion 5 is provided on the steel sleeve 4 is provided. A female screw hole 14 is provided over a predetermined length inside the end of the other existing hollow PC steel rod 6, and a male threaded sleeve 15 fixed to the single-strand steel material 2 is provided in the female screw hole of the hollow PC steel rod 6. 14 may be connected by screwing. As described above, the connection hardware on the single-strand steel material 2 side may be a male thread connection metal (a steel sleeve 4 with a male thread portion 5) in addition to the female thread connection metal 11 described above.

  In the above-described embodiment, since the horizontal hole 36 of the existing bridge 33 is not opened on the upper surface of the existing bridge 33, there is no construction from the upper surface of the existing bridge 33, and the construction method has less traffic obstacles on the upper surface side of the existing bridge 33. is there.

  Further, the integration of the existing bridge 33 and the new girder 1 is made so that the width of the existing girder 34 located at the new side end of the existing bridge 33 in the direction perpendicular to the bridge axis and the width of the new girder 1 are almost the same. Since the hollow PC steel rod or the single strand steel material by PC steel material is arrange | positioned and integrated, the existing girder 34 and the new girder 1 in the existing bridge 33 can be firmly integrated.

  In the case of carrying out the present invention, when the reaction force PC steel rod 7 is left, the bearing tube 25 is removed from the hollow PC steel rod 6 and hardened after the grout 17 is hardened, and the hollow PC steel rod 6 and the non-pulling reaction force are cured. In order to enhance the integrity of the PC steel bar 7 and improve the ultimate strength of the existing girder 34, an adhesive and rust preventive material comprising a time-curing type synthetic resin adhesive in which a retarder is appropriately mixed with a curable adhesive. May be injected and filled in advance from an end opening of the hollow PC steel rod 6 or at an appropriate time.

  In this case, after removing the support tube 25, the non-pulling reaction force PC steel rod 7 is not collected, but is left in the hollow PC steel rod 6 and used for adhesion of time-curing resin or the like that also serves as rust prevention. By hardening the rust preventive material, the hollow PC steel rod 6 and the non-pull PC steel rod 7 can be integrated.

  In the said embodiment, although the case of the single strand steel material 2 was shown as PC steel material of the new installation side, when implementing this invention, you may use PC steel materials other than the single strand steel material 2, for example, PC steel rod PC steel materials such as the above may be used, and the connection hardware 11 as shown in FIGS. 7 to 9 may be provided at the connection end portion on the existing side of the PC steel material. In this case, the sleeve may be fixed and a male screw portion may be provided and fixed by a bearing plate and a nut, or the end of the PC steel rod may be a wedge type fixing structure using a fixing wedge receiving bracket and a wedge.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing for demonstrating one Embodiment of this invention, Comprising: (a) is a longitudinal front view which shows the state of an existing bridge, (b) is the whole upper flange width from the side surface of an existing girder. It is a vertical front view which shows the state which drilled the horizontal hole. A hollow PC in the prestressing force introduction device is formed by inserting and arranging a prestressing force introduction device in the lateral hole in the state of FIG. 1A and filling and curing a non-shrink mortar between the precast introduction device and the lateral hole. It is a vertical front view which shows the state which introduced the tension force with the steel bar. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a prestress force introduction device used in the present invention, where (a) is a partially cutaway side view, and (b) is a partially cutout longitudinal side view. It is a longitudinal front view which shows the state which removed the support cylinder in the prestress force introduction apparatus from the state of FIG. 2, introduced the prestress into the existing bridge, and was tension-fixed the hollow PC steel bar to the existing bridge. The end of the hollow PC steel bar fixed to the existing bridge is connected to the connection hardware in the new tension fixing device, the new girder is installed in parallel, and the single strand steel material is inserted through the side hole of the new girder. It is a longitudinal front view shown. After placing concrete on the joints of the existing bridge and the new girder and fixing the single-strand steel, the non-shrink mortar is filled and hardened in the side hole of the new girder to integrate the existing bridge and the new girder. It is a vertical front view which shows the state. It is a vertical front view which expands and shows the connection part of the hollow PC steel bar of an existing side, and the connection metal fitting in a new side tension fixing apparatus. (A) And (b) is a longitudinal front view which expands and shows the connection part of the hollow PC steel bar of an existing side, and the connection metal fitting of the other form in a new side tension fixing apparatus, respectively. (A) is a longitudinal side view showing an enlarged connection metal and one end side connection part of a single strand steel material in the new-side tension fixing device, and (b) and (c) are other forms of the new-side tension fixing device. It is a vertical side view which expands and shows the connection metal part and the one end side connection part of a single strand steel material.

Explanation of symbols

1 New girder 2 Single strand steel (PC steel)
3 New Side Tension Fixing Device 4 Steel Sleeve 5 Male Threaded Part 6 Hollow PC Steel Bar 6a Hollow PC Steel Bar Body 7 Pushing Reaction Force PC Steel Bar 8 Prestress Force Introduction Device 9 Female Screw Hole 10 Insertion Hole 11 Connection Metal 12 Wedge 13 Inclined surface 14 Female threaded hole 15 Male threaded sleeve 16 Vertical joint 17 Grout 18 Fixing bracket 19 Anchor member 20 Male threaded part 21 Male threaded part 22 Female threaded hole 23 Female threaded hole 24 Rotating tool engaging outer surface 25 Bearing cylinder 26 Stopper 27 Front male threaded part 28 Rotating tool engaging outer surface 29 Recess 30 Press locking piece 31 Female thread 32 Anchor material 33 Existing bridge 34 Existing girder 35 Side hole 36 Side hole 37 Side hole 38 Upper flange 39 Existing lower structure 41 Male thread member 43 Bearing device 44 Concrete ( Or no shrink mortar)

Claims (5)

  A horizontal hole is provided in the existing bridge, a prestress force introduction device having a hollow PC steel rod is disposed in the horizontal hole, and grout is injected and hardened, and the hollow PC steel rod is embedded on the existing bridge side. Tension is fixed in the state, a new girder is arranged on the wide side of the existing bridge, a PC steel material is arranged in a lateral hole of the new girder, the PC steel material is connected to the wide side end of the hollow PC steel bar, and A widening connection structure for a bridge, wherein the PC steel is tension-fixed, grout is injected and hardened in a lateral hole of the new girder, and the existing bridge and the new girder are integrated.   2. The widening connection structure for a bridge according to claim 1, wherein a connecting metal provided on a single strand steel material side as a PC steel material is connected to a threaded portion of the end portion of the hollow PC steel rod.   2. The bridge widening connection structure according to claim 1, wherein prestress is introduced and integrated to a new girder arranged to widen from an existing bridge including a widening joint.   A horizontal hole is drilled in an existing bridge, a prestressing force introducing device having a hollow PC steel rod is arranged in the horizontal hole, and after grout is injected and hardened, the hollow PC steel rod is tension-fixed and the existing bridge Introducing pre-stress, placing a newly installed girder on the widened side of the existing bridge and inserting PC steel into the lateral hole of the newly installed girder, connecting the PC steel to the widened end of the hollow PC steel bar, A bridge widening connection method characterized by injecting grout after tensioning PC steel and integrating an existing bridge and a new girder. The bridge widening connection method according to claim 4, wherein a single strand steel material as the PC steel material is connected using a threaded portion of a hollow PC steel rod end.

Images